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Preparation method of ion-doped double perovskite structure tungsten molybdate oxide powder

A double perovskite and tungsten molybdate technology, applied in the field of fine chemicals, can solve the problems of irregular particle morphology, uneven dispersion, general performance, etc., and achieve the effects of uniform composition, cost reduction, and shortening of the test period.

Inactive Publication Date: 2013-07-17
NANJING TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the sol-gel method of glycine can also obtain the pure phase double perovskite powder, its particle shape is irregular, the dispersion is not uniform, and the performance is general (Guo Youbin, Yang Yong, Lu Lihua, etc. Journal of Silicates, 2010, (07), 1258-1262.)

Method used

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  • Preparation method of ion-doped double perovskite structure tungsten molybdate oxide powder
  • Preparation method of ion-doped double perovskite structure tungsten molybdate oxide powder
  • Preparation method of ion-doped double perovskite structure tungsten molybdate oxide powder

Examples

Experimental program
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Effect test

Embodiment 1

[0030] Example 1 # (Sr 2 CaO 6 ):

[0031] Composition as in Table 1 1 # Shown, specific preparation method comprises the following steps:

[0032] ① Weigh the solid powder raw material and solution according to the composition in Table 1. First, dissolve the quantitative ammonium molybdate and EDTA in an appropriate amount of ammonia solution, heat and stir to dissolve; Mix with the nitrate solution of metal ions, stir and heat; then add citric acid into the mixed solution, seal and stir for 20 minutes after the citric acid is dissolved; finally adjust the pH of the solution to 7 with ammonia water, and the total concentration of all metal ions in the entire solution system 1.0mol / L, the whole process has been stirred and heated, and the heating temperature is 35°C;

[0033] ②Put the prepared solution on a magnetic stirrer, stir for 40 minutes, open the seal, heat at 50°C and keep stirring for about 2.5 hours to form a sol; then increase the heating temperature to 70°C a...

Embodiment 2

[0040] Example 2 # (Sr 2 Ca(Mo 0.5 W 0.5 )0 6 ):

[0041] Composition as in Table 1 2 # Shown, specific preparation method comprises the following steps:

[0042] ① Weigh the solid powder raw material and solution according to the composition in Table 1. First, dissolve the quantitative ammonium molybdate and EDTA in an appropriate amount of ammonia solution, and dissolve the ammonium tungstate in an appropriate amount of deionized water, and heat and stir to dissolve respectively; wait until completely dissolved and clarified Finally, mix the ammonia solution of ammonium molybdate and EDTA with the nitrate solution of metal ions, stir and heat; then add citric acid into the mixed solution, and seal and stir for 20 minutes after the citric acid dissolves; finally adjust the pH of the solution with ammonia water = 7, then add the already dissolved ammonium tungstate solution into the mixed solution, the total concentration of all metal ions in the whole solution system is...

Embodiment 3

[0050] Example 3 # (Sr 2 wxya 6 ):

[0051] Composition as in Table 1 3 # Shown, specific preparation method comprises the following steps:

[0052] ① Weigh the solid powder raw material and solution according to the composition in Table 1. First, dissolve quantitative EDTA in an appropriate amount of ammonia solution, ammonium tungstate in an appropriate amount of deionized water, heat and stir to dissolve respectively; after completely dissolving and clarifying, dissolve the EDTA Mix the ammonia solution with the nitrate solution of metal ions, stir and heat; then add citric acid into the mixed solution, and seal and stir for 20 minutes after the citric acid dissolves; finally adjust the pH of the solution to 8 with ammonia water, and all metal ions in the entire solution system The total concentration is 1.15mol / L, and the whole process has been stirred and heated, and the heating temperature is 30°C;

[0053] ②Put the prepared solution on a magnetic stirrer, stir for ...

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Abstract

The invention relates to a preparation method of ion-doped double perovskite structure tungsten molybdate oxide powder. The preparation method is implemented through gelatinization and redox reaction of metal nitrate, tungsten ammonium molybdate, citric acid and ethylene diamine tetraacetic acid (EDTA) by a sol gel combustion synthesis method, wherein the citric acid and the EDTA serve as complexing agents. The prepared powder is a double perovskite component shown in the following formula: (A1-xMex)2B(Mo1-yWy)O6 or A2(B1-xMex)(Mo1-yWy)O6, wherein A is at least one of Ba, Sr or Ca; B is one of Ca, Mg, Ni, Fe, Co or Zn; A and B are not Ca at the same time; Me is one or two of rare elements or transition metal elements; x is more than or equal to 0.0 and less than or equal to 0.5; and y is more than or equal to 0 and less than or equal to 1. According to the prepared powder, single-phase ion-doped tungsten molybdenum substituted double perovskite oxide powder can be obtained under the conditions of low temperature and short heat-preserving time; test period is greatly shortened; cost is greatly reduced; and the method is particularly suitable for preparing rare earth-doped luminescent materials, magnetic resistance materials and the like with the structure type.

Description

technical field [0001] The present invention relates to a kind of preparation method of ion-doped double perovskite structure tungsten molybdate oxide powder, more precisely relates to a kind of using citric acid and ethylenediaminetetraacetic acid (EDTA) as complexing agent The preparation of tungsten-molybdenum intersubstituted double perovskite structure oxide powder by sol-gel combustion synthesis method belongs to the field of fine chemical industry. Background technique [0002] Double perovskite structure tungsten molybdate oxide (A 2 B I B II o 6 , B II =Mo or W) has a strong super-exchange effect and adjustable ultraviolet absorption sidebands, and is widely used in magnetoresistance materials, catalytic materials, luminescent materials and other fields. The double perovskite structure oxide is corresponding to the perovskite ABO 3 In terms of oxides, their structures can be seen as different BO 6 The octahedron is arranged in regular intervals, due to the B ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/495C04B35/624
Inventor 张其土张乐
Owner NANJING TECH UNIV
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